"What sort of toad is that?" Fair question! Toads are like the "Ninjas of the prairie", only less assassin-prone.
The Great Plains Toad, (Bufo cognatus), inhabit the grasslands of North Dakota. They are accomplished burrowers in loose soil and are found at night along roadsides, ditches, or anywhere else insects are plentiful. Similar to the Canadian & American Toad, these wee beasties can be distinguished by their dark, symmetrical blotches on their backs. They are not spotted underneath.
This toad is very fond of holes. Their species enters water for breeding purposes, but not for much else. It breeds in rain pools, flooded areas, and ponds and can frequently be heard singing the song of love. The males erupt in a chorus after it rains, announcing a wave of toad-hormones, which I suspect the the lady toads don't care for, but are too polite to actually tell them, "Hey! Yeah! That song sounds amazing when you croak it." is something the lady toads have to say all the time.
And deep down in his little toad heart, he knows it's a lie. Which is why he always looks like this.
There are many toads you might encounter through the year in North Dakota. UND has a handy-dandy-cheat-sheet on toads. I recommend.